Spectacles
Spectacles
Spectacles (/ˈspɛktəkəlz/), also known as eyeglasses or glasses, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, typically using a bridge over the nose and arms which rest over the ears.
Etymology
The term "spectacles" originates from the Latin word "spectaculum" which means "show, spectacle". The term was first used in English in the 14th century to describe a device used for seeing.
Usage
Spectacles are typically used for vision correction, such as with reading glasses and glasses used for nearsightedness. Safety glasses provide eye protection against flying debris for construction workers or lab technicians; these glasses may have protection for the sides of the eyes as well as in the lenses. Some types of safety glasses are used to protect against visible and near-visible light or radiation. Glasses are worn for eye protection in some sports, such as squash.
Related Terms
- Bifocals: Spectacles with lenses that have two different sections – for distance and for near vision.
- Trifocals: Spectacles that have lenses with three different sections – for distance, intermediate, and near vision.
- Progressive lens: Spectacles with a smooth transition between parts with different focal lengths, correcting vision at all distances.
- Contact lens: A thin lens placed directly on the surface of the eye as an alternative to spectacles.
See Also
External links
- Medical encyclopedia article on Spectacles
- Wikipedia's article - Spectacles
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